The Wii U will not have built-in storage. Previous reports indicated that the Wii U would come with 8 GB of internal storage, but the information comes from a mistranslation from Nintendo’s E3 analyst briefing and Q&A session.
Iwata stated, “We haven’t said anything about a hard drive that we’ll be including with the system itself. But we have said, through the USB connection, consumers will be able to take advantage of a wide range of the hard drives that are available on the market, and for quite cheap now, to add memory to their system however they like.”
Even though Nintendo is not including internal storage with the Wii U, it is possible that Nintendo may include an SD card with the system.
There had better be some storage! But if they go for really cheap they may not...